1. Mining. the underside of the wall rock overlying a vein or bed of ore. Cf. footwall (def. 1).
2. Geol. a mass of rock overhanging a fault plane.
[ 1770-80 ]
1. Mining. the underside of the wall rock overlying a vein or bed of ore. Cf. footwall (def. 1).
2. Geol. a mass of rock overhanging a fault plane.
[ 1770-80 ]
Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012